<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
		<style>
		</style>
	</head>
	<body>
		<div id="box">
			<span v-if="toLow>90">
				太棒了
			</span>

			<span v-else-if="toLow>=80">
				优秀
			</span>

			<span v-else>及格</span>
		</div>

		<script>
			new Vue({
				el: '#box',
				data: {
					toLow: 80,
					str: 'abcDEFghsjfhSDHGSJV'
				}
			})
		</script>
	</body>
</html>
